UK Tax Questions? Ask a UK Tax Advisor for answers ASAP
Your father will need to register for self-assessment to disclose his gains and losses. He can do that using a form SA1. Read about capital gains and tax returns here.Capital Gains Tax is payable on 31 January following the end of the tax year in which the liability arose. The tax year ends on 5 April so I would have thought that ten months is sufficient time to arrange to have the funds available to settle any tax liability.